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Blender 2.5 Materials and Textures Cookbook by Colin Litster

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Adding dirt onto a model

When we create materials for 3D objects in the digital world, they can tend to look too clean. Adding dirt is a common trick to add character and realism to our models. Creating dirt and grime can be a time consuming and difficult process using direct paint techniques. Blender has many tools that can be used to manually paint dirt marks onto materials. However, we will employ an ambient occlusion technique that in ordinary circumstances one would try to avoid because usually we try to steer clear of noise and artifacts in our ambient occlusion setups. Here, we will use it to create a rather nice cartoon look to a Disney-like candle stick with cartoon outlines as shown in the finished render in the following image:

Getting ...

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